The invention discloses a fumigation device for high-chlorine emamectin benzoate microemulsion insecticide. The device comprises a shell, a telescopic cylinder is connected with a supporting cylinderthrough a lifting mechanism, and a heating tube is installed in the shell. The heating tube works to heat the high-chlorine emamectin benzoate microemulsion insecticide in the shell, then evaporationis conducted to generate steam, the pressure inside the shell is increased, the insecticide steam enters the telescopic cylinder, fills the telescopic cylinder, and is then blown out of blowing holesto the portion between two elastic latex membranes, and the elastic latex membranes are annularly arranged; therefore, the high-chlorine emamectin benzoate microemulsion insecticide flies all around for insect killing, the diffusion area is large, the insecticide is dispersed in the circumference direction, propagation is faster, and the effect is better; by rotating a rotary mechanism, a threadedrod can be rotated, thus the threaded rod moves up and down relative to a transverse rod, the height of the telescopic cylinder is changed, thus the elastic latex membranes are stretched, the tilt degree of the elastic latex membranes is changed, the steam outlet direction is changed, the dispersion direction and effect are changed, and the device is more practical and flexible.